The observed changeof each signal as Cassini moved behind the rings provided a profile ofthe distribution of ring material as a function of distance fromSaturn, or an optical depth profile.
You should be thinking of the distribution for web content more as a signal for a radio show.
你更应该认为网络内容的分发是广播节目中的信号。
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Simulation results show that the selection of reference signal depends not only on the correlation , but also on the distribution of vibration energy, which can be used to guide the signal selection.